This road sign means:

This sign indicates a reduction in the number of lanes ahead. Drivers in the right lane must prepare to merge left, while those in the left lane should be prepared to change lanes or to allow other vehicles to merge smoothly. Lane reductions can occur temporarily due to construction or maintenance, or they can be permanent. In either case, adjust your speed and position to safely accommodate the lane reduction and merging vehicles. When traffic is light, merge into the open lane as soon as possible to ensure a smooth flow of traffic.

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